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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
div {
background-color: lime;
height: 100px;
}
</style>
</head>
<body>
<div class="infinity"></div>
<div class="infinity-delay-iteration-start"></div>
<div class="limited"></div>
<script>
"use strict";
document.querySelector(".infinity").animate(
{ opacity: [1, 0] },
{ duration: Infinity }
);
document.querySelector(".infinity-delay-iteration-start").animate(
{ opacity: [1, 0] },
{
delay: 100000,
duration: Infinity,
iterationStart: 0.5,
}
);
document.querySelector(".limited").animate(
{ opacity: [1, 0] },
{
duration: 100000,
}
);
</script>
</body>
</html>